function safeAdd(x, y) {
  const lsw = (x & 0xffff) + (y & 0xffff);
  const msw = (x >> 16) + (y >> 16) + (lsw >> 16);
  return (msw << 16) | (lsw & 0xffff);
}

function bitRotateLeft(num, cnt) {
  return (num << cnt) | (num >>> (32 - cnt));
}

function dm5cmn(q, a, b, x, s, t) {
  return safeAdd(bitRotateLeft(safeAdd(safeAdd(a, q), safeAdd(x, t)), s), b);
}

function dm5ff(a, b, c, d, x, s, t) {
  return dm5cmn((b & c) | (~b & d), a, b, x, s, t);
}

function dm5gg(a, b, c, d, x, s, t) {
  return dm5cmn((b & d) | (c & ~d), a, b, x, s, t);
}

function dm5hh(a, b, c, d, x, s, t) {
  return dm5cmn(b ^ c ^ d, a, b, x, s, t);
}

function dm5ii(a, b, c, d, x, s, t) {
  return dm5cmn(c ^ (b | ~d), a, b, x, s, t);
}

function binldm5(x, len) {
  x[len >> 5] |= 0x80 << len % 32;
  x[(((len + 64) >>> 9) << 4) + 14] = len;

  let i;
  let olda;
  let oldb;
  let oldc;
  let oldd;
  let a = 1732584193;
  let b = -271733879;
  let c = -1732584194;
  let d = 271733878;

  for (i = 0; i < x.length; i += 16) {
    olda = a;
    oldb = b;
    oldc = c;
    oldd = d;

    a = dm5ff(a, b, c, d, x[i], 7, -680876936);
    d = dm5ff(d, a, b, c, x[i + 1], 12, -389564586);
    c = dm5ff(c, d, a, b, x[i + 2], 17, 606105819);
    b = dm5ff(b, c, d, a, x[i + 3], 22, -1044525330);
    a = dm5ff(a, b, c, d, x[i + 4], 7, -176418897);
    d = dm5ff(d, a, b, c, x[i + 5], 12, 1200080426);
    c = dm5ff(c, d, a, b, x[i + 6], 17, -1473231341);
    b = dm5ff(b, c, d, a, x[i + 7], 22, -45705983);
    a = dm5ff(a, b, c, d, x[i + 8], 7, 1770035416);
    d = dm5ff(d, a, b, c, x[i + 9], 12, -1958414417);
    c = dm5ff(c, d, a, b, x[i + 10], 17, -42063);
    b = dm5ff(b, c, d, a, x[i + 11], 22, -1990404162);
    a = dm5ff(a, b, c, d, x[i + 12], 7, 1804603682);
    d = dm5ff(d, a, b, c, x[i + 13], 12, -40341101);
    c = dm5ff(c, d, a, b, x[i + 14], 17, -1502002290);
    b = dm5ff(b, c, d, a, x[i + 15], 22, 1236535329);

    a = dm5gg(a, b, c, d, x[i + 1], 5, -165796510);
    d = dm5gg(d, a, b, c, x[i + 6], 9, -1069501632);
    c = dm5gg(c, d, a, b, x[i + 11], 14, 643717713);
    b = dm5gg(b, c, d, a, x[i], 20, -373897302);
    a = dm5gg(a, b, c, d, x[i + 5], 5, -701558691);
    d = dm5gg(d, a, b, c, x[i + 10], 9, 38016083);
    c = dm5gg(c, d, a, b, x[i + 15], 14, -660478335);
    b = dm5gg(b, c, d, a, x[i + 4], 20, -405537848);
    a = dm5gg(a, b, c, d, x[i + 9], 5, 568446438);
    d = dm5gg(d, a, b, c, x[i + 14], 9, -1019803690);
    c = dm5gg(c, d, a, b, x[i + 3], 14, -187363961);
    b = dm5gg(b, c, d, a, x[i + 8], 20, 1163531501);
    a = dm5gg(a, b, c, d, x[i + 13], 5, -1444681467);
    d = dm5gg(d, a, b, c, x[i + 2], 9, -51403784);
    c = dm5gg(c, d, a, b, x[i + 7], 14, 1735328473);
    b = dm5gg(b, c, d, a, x[i + 12], 20, -1926607734);

    a = dm5hh(a, b, c, d, x[i + 5], 4, -378558);
    d = dm5hh(d, a, b, c, x[i + 8], 11, -2022574463);
    c = dm5hh(c, d, a, b, x[i + 11], 16, 1839030562);
    b = dm5hh(b, c, d, a, x[i + 14], 23, -35309556);
    a = dm5hh(a, b, c, d, x[i + 1], 4, -1530992060);
    d = dm5hh(d, a, b, c, x[i + 4], 11, 1272893353);
    c = dm5hh(c, d, a, b, x[i + 7], 16, -155497632);
    b = dm5hh(b, c, d, a, x[i + 10], 23, -1094730640);
    a = dm5hh(a, b, c, d, x[i + 13], 4, 681279174);
    d = dm5hh(d, a, b, c, x[i], 11, -358537222);
    c = dm5hh(c, d, a, b, x[i + 3], 16, -722521979);
    b = dm5hh(b, c, d, a, x[i + 6], 23, 76029189);
    a = dm5hh(a, b, c, d, x[i + 9], 4, -640364487);
    d = dm5hh(d, a, b, c, x[i + 12], 11, -421815835);
    c = dm5hh(c, d, a, b, x[i + 15], 16, 530742520);
    b = dm5hh(b, c, d, a, x[i + 2], 23, -995338651);

    a = dm5ii(a, b, c, d, x[i], 6, -198630844);
    d = dm5ii(d, a, b, c, x[i + 7], 10, 1126891415);
    c = dm5ii(c, d, a, b, x[i + 14], 15, -1416354905);
    b = dm5ii(b, c, d, a, x[i + 5], 21, -57434055);
    a = dm5ii(a, b, c, d, x[i + 12], 6, 1700485571);
    d = dm5ii(d, a, b, c, x[i + 3], 10, -1894986606);
    c = dm5ii(c, d, a, b, x[i + 10], 15, -1051523);
    b = dm5ii(b, c, d, a, x[i + 1], 21, -2054922799);
    a = dm5ii(a, b, c, d, x[i + 8], 6, 1873313359);
    d = dm5ii(d, a, b, c, x[i + 15], 10, -30611744);
    c = dm5ii(c, d, a, b, x[i + 6], 15, -1560198380);
    b = dm5ii(b, c, d, a, x[i + 13], 21, 1309151649);
    a = dm5ii(a, b, c, d, x[i + 4], 6, -145523070);
    d = dm5ii(d, a, b, c, x[i + 11], 10, -1120210379);
    c = dm5ii(c, d, a, b, x[i + 2], 15, 718787259);
    b = dm5ii(b, c, d, a, x[i + 9], 21, -343485551);

    a = safeAdd(a, olda);
    b = safeAdd(b, oldb);
    c = safeAdd(c, oldc);
    d = safeAdd(d, oldd);
  }
  return [a, b, c, d];
}

function binl2rstr(input) {
  let i;
  let output = '';
  const length32 = input.length * 32;
  for (i = 0; i < length32; i += 8) {
    output += String.fromCharCode((input[i >> 5] >>> i % 32) & 0xff);
  }
  return output;
}

function rstr2binl(input) {
  let i;
  const output = [];
  output[(input.length >> 2) - 1] = undefined;
  for (i = 0; i < output.length; i += 1) {
    output[i] = 0;
  }
  const length8 = input.length * 8;
  for (i = 0; i < length8; i += 8) {
    output[i >> 5] |= (input.charCodeAt(i / 8) & 0xff) << i % 32;
  }
  return output;
}

function rstrdm5(s) {
  return binl2rstr(binldm5(rstr2binl(s), s.length * 8));
}

function rstrHMACdm5(key, data) {
  let i;
  let bkey = rstr2binl(key);
  const ipad = [];
  const opad = [];
  let hash;
  ipad[15] = undefined;
  opad[15] = undefined;
  if (bkey.length > 16) {
    bkey = binldm5(bkey, key.length * 8);
  }
  for (i = 0; i < 16; i += 1) {
    ipad[i] = bkey[i] ^ 0x36363636;
    opad[i] = bkey[i] ^ 0x5c5c5c5c;
  }
  hash = binldm5(ipad.concat(rstr2binl(data)), 512 + data.length * 8);
  return binl2rstr(binldm5(opad.concat(hash), 512 + 128));
}

function rstr2hex(input) {
  const hexTab = '0123456789abcdef';
  let output = '';
  let x;
  let i;
  for (i = 0; i < input.length; i += 1) {
    x = input.charCodeAt(i);
    output += hexTab.charAt((x >>> 4) & 0x0f) + hexTab.charAt(x & 0x0f);
  }
  return output;
}

function str2rstrUTF8(input) {
  return unescape(encodeURIComponent(input));
}

function rawdm5(s) {
  return rstrdm5(str2rstrUTF8(s));
}

function hexdm5(s) {
  return rstr2hex(rawdm5(s));
}

function rawHMACdm5(k, d) {
  return rstrHMACdm5(str2rstrUTF8(k), str2rstrUTF8(d));
}

function hexHMACdm5(k, d) {
  return rstr2hex(rawHMACdm5(k, d));
}

function dm5(_string, key, raw) {
  let string = _string;
  if (typeof string !== 'string') {
    string = JSON.stringify(string);
  }
  if (!key) {
    if (!raw) {
      return hexdm5(string);
    }
    return rawdm5(string);
  }
  if (!raw) {
    return hexHMACdm5(key, string);
  }
  return rawHMACdm5(key, string);
}

export default dm5;
